add 'unset' to DimensionValue type

[SaadAhmadSaddiqui]

Summary:

Adds the unset property for DimensionValue type as it works.

Test plan:

Create a component button with a height of 56 for example, and pass it style props. When using that component, send styles in the styles prop with a height of unset. Produces no errors on both iOS and Android.

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[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,500,330	-9,327,997
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	9,754,944	-11,431,848
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 15700626cc9d42e52edeb491fb2bba1f118f62e7 Branch: main

[github-actions[bot]]

	Fails
:no_entry_sign:	:clipboard: Missing Changelog - Please add a Changelog to your PR description. See Changelog format

	Warnings
:warning:	Can't find the E2E test log for ci/circleci: test_e2e_ios. Job link
:warning:	Can't find the E2E test log for ci/circleci: test_e2e_ios. Job link

Generated by :no_entry_sign: dangerJS against c3e06008584b7653477e078e5f6f8cf27d23f838

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[react-native-bot]

This PR is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.